US8427621B2 - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- US8427621B2 US8427621B2 US13/174,214 US201113174214A US8427621B2 US 8427621 B2 US8427621 B2 US 8427621B2 US 201113174214 A US201113174214 A US 201113174214A US 8427621 B2 US8427621 B2 US 8427621B2
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133345—Insulating layers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134336—Matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
Definitions
- a liquid crystal display is provided.
- a liquid crystal display as one of flat panel display devices that are widely being used includes two panels where a pair of field generating electrodes is formed and a liquid crystal layer interposed therebetween.
- the liquid crystal display generates an electric field in a liquid crystal layer by applying voltage to the field generating electrode, to determine orientations of liquid crystal molecules of the liquid crystal layer and control polarization of incident light, thereby displaying an image.
- the liquid crystal display includes a switching element connected to a pixel electrode and a plurality of signal lines such as gate lines and data lines for applying the voltage to the pixel electrode by controlling the switching element.
- a vertically aligned mode liquid crystal display in which a long axis of the liquid crystal molecules is aligned to be perpendicular to the panel while the electric field is not applied, has a high contrast ratio and a wide reference viewing angle.
- Exemplary embodiments provide a liquid crystal display that may have improved transmittance and response speed of the liquid crystal molecules.
- a liquid crystal display includes: a first substrate; a second substrate facing the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate and including liquid crystal molecules; and a pixel electrode including a first subpixel electrode and a second subpixel electrode, in which a shape of the second subpixel electrode is a quadrilateral in which two angles facing each other are obtuse angles or acute angles and the first subpixel electrode surrounds the second subpixel electrode.
- FIG. 1 is an equivalent circuit diagram for one pixel of a liquid crystal display according to an exemplary embodiment.
- FIG. 3 is a layout view for one pixel of the liquid crystal display shown in FIG. 1 .
- FIG. 4 is a cross sectional view taken along line III-III of FIG. 3 .
- FIG. 5 is a layout view for one pixel of a liquid crystal display according to an exemplary embodiment.
- FIG. 7 is a layout view for one pixel of a liquid crystal display according to an exemplary embodiment.
- FIG. 9 is a layout view for one pixel of a liquid crystal display according to an exemplary embodiment.
- FIG. 10 is a cross sectional view taken along line IX-IX of FIG. 9 .
- spatially relative terms such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
- FIG. 1 is an equivalent circuit diagram for one pixel of a liquid crystal display according to an exemplary embodiment.
- FIG. 2 is a waveform diagram of a signal applied to a pixel of a liquid crystal display according to an exemplary embodiment.
- one pixel PX of the liquid crystal display includes a first subpixel electrode PEa and a second subpixel electrode PEb.
- the pixel PX include multiple signal lines including a gate line GL transmitting a gate signal, a data line DL transmitting a data signal, and a reference voltage line RL transmitting a reference voltage Vr.
- the pixel PX includes a first switching element Qa, a second switching element Qb, and a third switching element Qc that are connected to multiple signal lines.
- the pixel PX includes a first liquid crystal capacitor Clca and a second liquid crystal capacitor Clcb.
- the third switching element Qc and the reference voltage line RL may be omitted.
- a control terminal of the first switching element Qa is connected to the gate line GL, an input terminal of the first switching element Qa is connected to the data line DL, and an output terminal of the first switching element Qa is connected to the first liquid crystal capacitor Clca.
- a control terminal of the second switching element Qb is connected to the gate line GL, an input terminal of the second switching element Qb is connected to the data line DL, and an output terminal of the second switching element Qb is connected to the second liquid crystal capacitor Clcb and an input terminal of the third switching element Qc.
- a control terminal of the third switching element Qc is connected to the gate line GL, the input terminal of the third switching element Qc is connected to the second liquid crystal capacitor Clcb, and an output terminal of the third switching element Qc is connected to the reference voltage line RL.
- the reference voltage Vr is applied through the reference voltage line RL and a common voltage Vcom is applied through a common electrode. If a gate on signal Von is applied to the gate line GL, the first switching element Qa, the second switching element Qb, and the third switching element Qc are turned on.
- the data voltage applied to the data line DL is applied to the first subpixel electrode PEa and the second subpixel electrode PEb through the first switching element Qa and the second switching element Qb, respectively.
- the data voltage applied to the first subpixel electrode PEa and the second subpixel electrode PEb may be charged by the same value.
- the voltage applied to the second subpixel electrode PEb is divided between the third switching element Qc and the second switching element Qb, which is connected to the Qc in series.
- a voltage Vb applied to the second subpixel electrode PEb may be smaller than a voltage Va applied to the first subpixel electrode PEa.
- the voltage stored in the first liquid crystal capacitor Clca and the voltage stored in the second liquid crystal capacitor Clcb may be different from each other. Therefore, the inclined angles of the liquid crystal molecules may be different in the first subpixel electrode PEa and the second subpixel electrode PEb.
- a luminance of the first subpixel and a luminance of the second subpixel may be different from each other.
- a voltage that is smaller than the voltage applied to the first subpixel may be applied to the second subpixel.
- the voltage applied to the second subpixel and the voltage applied to the first subpixel may be swung based on the common voltage Vcom. If the reference voltage Vr is applied through the reference voltage line RL connected to the third switching element Qc, the voltage applied to the second subpixel may increase and a difference between an optimal common voltage in the first subpixel and an optimal common voltage in the second subpixel may decrease. Accordingly, afterimage and flicker generated by distortion of the common voltages in the first subpixel and the second subpixel may decrease, thereby improving visibility.
- the reference voltage Vr may be swung. If the reference voltage is swung, transmittance may be improved, because a voltage level applied to the second subpixel in a positive polarity increases and a voltage level applied to the second subpixel in a negative polarity decreases. Furthermore, the reference voltage Vr may be swung while being higher than the common voltage Vcom and in this case, a kickback voltage of the second subpixel may decreases and the flicker and the afterimage generated by distortion of the common voltage may be minimized.
- the reference voltage Vr may include a swing signal having a duty ratio of 50% to 80%.
- FIG. 3 is a layout view for one pixel of the liquid crystal display shown in FIG. 1 .
- FIG. 4 is a cross sectional view taken along line III-III of FIG. 3 .
- the liquid crystal display includes a lower panel 100 and an upper panel 200 which face each other and a liquid crystal layer 3 interposed between lower panel 100 and upper panel 200 .
- a pair of polarizers may be disposed at the outer surfaces of the panels 100 and 200 .
- a substrate 110 may contain an insulating material such as glass or plastic and may be transparent.
- a gate line 121 is disposed on the substrate 110 .
- the gate line 121 includes a first gate electrode 124 a , a second gate electrode 124 b , a third gate electrode 124 c , and a wide end portion (not shown) for connecting other layer or an external driving circuit.
- a gate insulating layer 140 is disposed on the gate line 121 .
- a first semiconductor 154 a , a second semiconductor 154 b , and a third semiconductor 154 c are disposed on the gate insulating layer 140 .
- Multiple ohmic contacts 163 a , 165 a , 163 b , 165 b , 163 c , and 165 c are positioned on the first semiconductor 154 a , the second semiconductor 154 b , and the third semiconductor 154 c.
- the data conductors, the semiconductors, and the ohmic contacts positioned below the data conductors may be simultaneously formed using one mask.
- the data line 171 includes a wide end portion (not shown) for connecting other layer and an external driving circuit.
- the reference voltage line 177 includes two vertical parts 177 a approximately parallel to the data line 171 and a horizontal part 177 b connecting the two vertical parts 177 a to each other. Delays in a signal flow into the reference voltage line 177 may be prevented by connecting the two vertical parts 177 a to the horizontal part 177 b.
- the vertical part 177 a of the reference voltage line 177 is positioned between the pixel electrode 191 and the data line 171 and is connected to the third drain electrode 175 c .
- the horizontal part 177 b of the reference voltage line 177 is positioned between the pixel electrode 191 and the gate line 121 . Accordingly, the reference voltage line 177 may reduce signal interferences between the pixel electrode 191 and the data line 171 and between the pixel electrode 191 and the gate line 121 .
- the first gate electrode 124 a , the first source electrode 173 a , and the first drain electrode 175 a form the first thin film transistor Qa together with the first semiconductor 154 a and a channel of the thin film transistor formed in the semiconductor portion 154 a between the first source electrode 173 a and the first drain electrode 175 a .
- the second gate electrode 124 b , the second source electrode 173 b , and the second drain electrode 175 b form the second thin film transistor Qb together with the second semiconductor 154 b , a channel of the thin film transistor formed in the semiconductor portion 154 b between the second source electrode 173 b and the second drain electrode 175 b .
- the third gate electrode 124 c , the third source electrode 173 c and the third drain electrode 175 c form the third thin film transistor Qc together with the third semiconductor 154 c , and a channel of the thin film transistor is formed in the semiconductor portion 154 c between the third source electrode 173 c and the third drain electrode 175 c.
- a passivation layer 180 is formed on the data conductors 171 , 173 a , 173 b , 173 c , 175 a , 175 b , 175 c , and 177 and the exposed semiconductor portions 154 a , 154 b , and 154 c .
- the passivation layer 180 may contain an inorganic insulating material such as silicon nitride and silicon oxide or an organic insulating material and may have a flat surface.
- the inorganic insulating material may have photosensitivity and dielectric constant of about 4.0 or less.
- the passivation layer 180 may have a two-layer structure including a lower inorganic layer and an upper inorganic layer to prevent the damage to the exposed semiconductor portions 154 a , 154 b , and 154 c while maintaining the insulating property of an organic layer.
- Multiple contact holes 185 a and 185 b which expose the first drain electrode 175 a and the second drain electrode 175 b , are formed in the passivation layer 180 .
- the second subpixel electrode 191 b includes a cross stem 193 including a horizontal stem and a vertical stem crossing therewith.
- the horizontal stem may be approximately parallel to the gate line 121
- the vertical stem may be approximately parallel to the data line 171 .
- the horizontal stem may be approximately perpendicular to the vertical stem.
- the second subpixel electrode 191 b may be divided into four subregions by the cross stem 193 and each of the subregions may include a plurality of branches 194 and an oblique side portion 195 .
- the oblique side portion 195 connects ends of the multiple branches 194 to each other.
- the four subregions of the second subpixel electrode 191 b are an upper right region, a lower right region, an upper left region, and a lower left region.
- the branches 194 of the second subpixel electrode 191 b obliquely extend toward an upper right direction, a lower right direction, a lower left direction, and an upper left direction from the cross stem 193 , respectively.
- the branches 194 of the second subpixel electrode 191 b may extend at an angle of approximately 35 degrees to approximately 55 degrees from the cross stem 193 .
- widths of the multiple branches 194 may gradually increase.
- the branches 197 of the first subpixel electrode 191 a obliquely extend toward an upper right direction, a lower right direction, a lower left direction, and an upper left direction from the cross stem 193 around four corners of the quadrangular surrounding portion 196 , respectively.
- the branches 197 of the first subpixel electrode 191 a may extend at an angle of approximately 35 degrees to approximately 55 degrees.
- widths of the multiple branches 197 may gradually increase.
- the shape of the branches 194 of the lower left region of the second subpixel electrode 191 b which is rotated 180 degrees may be approximately the same as the shape of the branches 197 of the lower left region of the first subpixel electrode 191 a , thereby easily controlling the generation of a texture.
- the first subpixel electrode 191 a and the second subpixel electrode 191 b are physically and electrically connected to the first drain electrode 175 a and the second drain electrode 175 b through contact holes 185 a and 185 b , respectively and receive the data voltage from the first drain electrode 175 a and the second drain electrode 175 b .
- a part of the data voltage applied to the second drain electrode 175 b is divided through the third source electrode 173 c , such that a magnitude of the voltage applied to the second subpixel electrode 191 b may be smaller than that of the voltage applied to the first subpixel electrode 191 a.
- an area of the second subpixel electrode 191 b may be about one time to two times larger than that of an area of the first subpixel electrode 191 a.
- the percentage of the first channel ratio in the sum of the first channel ratio and the second channel ratio may be about 60% to 95%.
- the percentage of the first channel ratio for the sum of the first channel ratio and the second channel ratio may be about 70% to about 80%.
- the voltage level applied to the reference voltage line may be higher than the common voltage level applied to the common electrode and a difference between absolute values thereof may be about 1V to about 4V.
- the common voltage Vcom is about 7V
- the reference voltage Vr may be about 8V to about 11V.
- the upper panel 200 will be described with reference to FIG. 3 and FIG. 4 .
- a light blocking member 220 is positioned on a substrate 210 .
- the light blocking member 220 is called a black matrix and may prevent light leakage.
- multiple color filters 230 are positioned on the substrate 210 and light blocking member 220 .
- the color filters 230 may be mostly disposed in a region surrounded by the light blocking member 220 and may elongate along columns of the pixel electrode 191 .
- the multiple color filters 230 may display one of three primary colors i.e. red, green, and blue. However, the color filters are not limited to three primary colors and may display one of cyan, magenta, yellow, and white-based colors.
- At least one of the light blocking member 220 and the color filters 230 may be formed on the lower substrate 110 .
- An overcoat 250 is positioned on the color filters 230 and the light blocking member 220 .
- the overcoat 250 may contain an insulating material to prevent the color filter 230 from being exposed and provide a flat surface. In an exemplary embodiment, the overcoat 250 may be omitted.
- a common electrode 270 is positioned on the overcoat 250 .
- the liquid crystal layer 3 is interposed between the two panels 100 and 200 .
- the liquid crystal layer 3 includes liquid crystal molecules 31 having a negative dielectric anisotropy. For ease of description, only one liquid crystal molecule 31 is depicted in FIG. 4 .
- the liquid crystal molecules 31 of the liquid crystal layer 3 have a pretilt so that a long axis is approximately parallel to longitudinal directions of the branches 194 and 197 of the first and the second subpixel electrodes 191 a and 191 b and may be aligned to be perpendicular to the surfaces of the two panels 100 and 200 if the electric field is not applied.
- the liquid crystal layer 3 further includes an alignment aiding agent including reactive mesogen.
- the liquid crystal molecules 31 may have a pretilt so that the long axis thereof is approximately parallel to the longitudinal directions of the branches 194 and 197 of the first and the second subpixel electrodes 191 a and 191 b by the alignment aiding agent.
- the first subpixel electrode 191 a and the second subpixel electrode 191 b which receive the data voltage, generate the electric field together with the common electrode 270 , which receives the common voltage.
- a direction of the liquid crystal molecules of the liquid crystal layer 3 between the two electrodes 191 a , 191 b , and 270 may be determined. In this case, polarization of light passing through the liquid crystal layer 3 varies based on the determined direction of the liquid crystal molecules.
- the first and the second subpixel electrodes 191 a and 191 b and the common electrode 270 form liquid crystal capacitors Clca and Clcb and maintain the applied voltage even after the thin film transistor is turned off.
- the dummy pixel portion 198 may disperse the force applied to the liquid crystal and accordingly, an alignment direction of the liquid crystal around the corner of the surrounding portion 196 of the first subpixel electrode 191 a may be similar to that of the branches 197 of the first subpixel electrode 191 a . As a result, the dummy pixel portion 198 may reduce the disclination generated around the corner of the first subpixel electrode 191 a and improve the transmittance.
- the first subpixel electrode 191 a includes a dummy pixel portion 198 , which is disposed around the corner of the first subpixel electrode 191 a .
- the dummy pixel portion 198 includes branches.
- the dummy pixel portion 198 may overlap the light blocking member 220 and be disposed in a non-display region.
- the dummy pixel portion 198 may extend in a direction which is symmetrical around on the surrounding portion 196 of the first subpixel electrode 191 a and symmetrical with the branches 197 of the first subpixel electrode 191 a .
- the lengths of the multiple dummy pixel portions 198 may be approximately equal.
- the lengths of the multiple dummy pixel portions 198 may be variously designed.
- the dummy pixel portion 198 may disperse the force applied to the liquid crystal and accordingly, an alignment direction of the liquid crystal around the corner of the surrounding portion 196 of the first subpixel electrode 191 a may be similar to that of the branches 197 of the first subpixel electrode 191 a .
- the dummy pixel portion 198 may reduce the disclination generated around the corner of the first subpixel electrode 191 a and improve the transmittance.
- FIG. 9 is a layout view for one pixel of a liquid crystal display according to an exemplary embodiment.
- FIG. 10 is a cross sectional view taken along line IX-IX of FIG. 9 . Where the description of FIG. 9 and FIG. 10 duplicates the descriptions of FIG. 1 to FIG. 4 it is omitted.
- the liquid crystal display includes a blocking member 127 a .
- the blocking member 127 a is disposed below a vertical portion 177 a of the reference voltage line 177 and positioned on the substrate 110 , the same layer as the gate line 121 .
- transmittance and response speed of the liquid crystal molecules may be improved.
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Abstract
Description
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KR1020110022294A KR101820796B1 (en) | 2011-03-14 | 2011-03-14 | Liquid crystal display |
KR10-2011-0022294 | 2011-03-14 |
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US20120236245A1 US20120236245A1 (en) | 2012-09-20 |
US8427621B2 true US8427621B2 (en) | 2013-04-23 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8169582B2 (en) * | 2008-01-29 | 2012-05-01 | Samsung Electronics Co., Ltd. | Liquid crystal display |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100595458B1 (en) | 2004-05-22 | 2006-07-03 | 엘지.필립스 엘시디 주식회사 | In-plain switching liquid cristalline display device |
JP5121529B2 (en) | 2008-03-27 | 2013-01-16 | 株式会社ジャパンディスプレイウェスト | Liquid crystal display device and electronic device |
-
2011
- 2011-03-14 KR KR1020110022294A patent/KR101820796B1/en active IP Right Grant
- 2011-06-30 US US13/174,214 patent/US8427621B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8169582B2 (en) * | 2008-01-29 | 2012-05-01 | Samsung Electronics Co., Ltd. | Liquid crystal display |
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Also Published As
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KR101820796B1 (en) | 2018-01-23 |
KR20120104720A (en) | 2012-09-24 |
US20120236245A1 (en) | 2012-09-20 |
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